USE-SYMSIMP is a flag or parameter.
When true, indicates that symmetric simplification should be
used when possible in translating from expansion proof to natural deduction
proof. Consult Pfenning's thesis for a description of symmetric
USE-SYMSIMP takes values of type BOOLEAN.
It belongs to subjects MS93-1 MS92-9 MS91-7 MS91-6 MS90-9 MS90-3 MS89 MS88 TACTICS ETR-NAT MATING-SEARCH .
Its default value is T
Its current value is T.

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